Joachim's Ko-Semeai - Putting the Cart
Before the Horse (2013 - 2015)
9b - White Kills Black's Group in the Lower Left
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( (Referenced by We inserted White's gote-sente-combination of
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We consider Black's option first. White's group has six liberties (w, 4 * c, m, Black's group has eight liberties (3 * b, 4 * c, k), so we are a bit early here. |
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///: We consider White's options now. Even if White waits a bit too long before capturing the ko for the first time, Black will not be able to win.
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///: Please note that inserting the exchange of |
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White has the points |

988
95
,
,
, in the hanezeki, which leaves Black behind in a grave dilemma.
is a suicidal ko-threat, so it is not available now.
, and
, are no valid ko-threats, because White's centre group has five liberties left. Black's ko-threats
, and
, in the nakade are compensated for by White's ko-threats
, and
, in the top left corner. This implies that Black cannot have occupied a shared liberty, at
, but must have captured
on the upper edge, instead. Another option would be that White did not capture the ko, but occupied a liberty, instead.
captured the ko on the upper edge.
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for
there are no valid ko-threats in the nakade any more. Therefore, Black is forced to connect the hanezeki's tail.
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, instead, will result in a change in the order of moves.
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to
available for her four moves in a row, also killing Black's large 
